TEM asbestos air sample results, NYC BOE, Jan 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 6427 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 12 Grid Opening Size: 0.01124 Client Sample #: 12 Area Examined: 0.04496 mm- GRID BOX: 7^3 Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 1/25/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or EDS No >=05 u (Nonadb F B C >=5(j Chrys Amphibole I Nonasb Ambig/ND No Coord <5|J Elements)

/

Struct = >0.5p >5:1 Aspect Ratio Grid acceptance; A- Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >60% coverage ate least 20 unfolded or overlapped grid squares <5% F B C j M >5u v/= EDS spectrum conforming to laboratory holes or opaque areas identification critena observed Chrvsotile AMPHIBOLES Ampliibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) ; Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected _____ I

CONFIDENTIAL, CITY_21MC100_003467519 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180780